What does the Bible say about the martyrs in Revelation?

In Revelation 6:9-11, martyrs are depicted as those who have been slain for their unyielding testimony to the Word of God. The passage shows that their unjust deaths invoke God's righteous judgment as they plead, 'How long, O Lord, holy and true, dost thou not judge and avenge our blood?' This reflects a biblical understanding that martyrs are honored by God as they have stood firm in their faith despite persecution, and their sacrifices are known to Him. Their blood speaks to God's covenant justice, affirming that He will ultimately avenge them in His perfect timing.